问题补充:
We can never expect bluer sky unless we create less polluted world.
A. a;a
B. a;the
C. the;a
D. the;the
答案:
(答案→)A. a;a
B. a;the
C. the;a
D. the;the
解析:句中sky与world都表示泛指,a表示“一”这个数量,相当于“one”。
答案A
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